Method for recovering rhodium chloride from rhodium slag
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A technology for rhodium chloride and rhodium slag, which is applied in the field of recovery of rhodium chloride, which can solve problems such as high equipment requirements, environmental pollution, and complicated processes, and achieve the effects of simple operation methods, improved conversion rates, and reduced adsorption
Active Publication Date: 2020-07-14
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Although these methods can reclaim most of the rhodium in the spent catalyst, the inventors have found that there are many problems, some of whic
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Embodiment 1
[0052] (1) Get 500g rhodium ash and 300g sodium formate to mix, put into the muffle furnace, carry out pre-reduction under the condition of 250 ℃;
[0053] (2) Add hydrochloric acid to the pre-reduced rhodium ash at 80° C., mechanically stir for 2 hours, and repeat 4 times to reduce the iron content in the rhodium ash as much as possible.
[0054] (3) The rhodium ash after iron removal is mixed with 10 mass times of sodium bisulfate and 1 times of sodium chloride, ground and mixed into powder with a mortar and placed in a porcelain boat.
[0055] (4) Put the sample into a muffle furnace, raise the temperature to 350°C, keep it warm for 2 hours, then raise the temperature to 600°C, react for 3h, cool down and take it out to room temperature.
[0056] (5) adding desalted water to extract the molten material to obtain a khaki solution, filtering the extracted material, and collecting the filtrate.
[0057] (6) Add 10% sodium hydroxide solution to the filtrate, adjust the pH to 8...
Embodiment 2
[0064] Raw material, amount of raw material, device and steps are the same as in Example 1, except that the pre-reduction after the mixing of rhodium ash and formate is not carried out. Analysis and detection show that the purity of rhodium chloride is 99.34%, and the recovery rate of rhodium is 92.68%.
Embodiment 3
[0066] The raw materials, raw material amounts, devices and steps are the same as in Example 1, except that an appropriate amount of acid is not added to the pre-reduced rhodium ash, and the base metal in the rhodium ash is not eluted in advance. Analysis and detection showed that the purity of rhodium chloride was 99.52%, and the recovery rate of rhodium was 92.32%.
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Abstract
The invention relates to a method for recovering rhodium chloride from rhodium slag. The method comprises the steps of: performing rhodium ash pretreatment, rhodium ash acid pickling, acid salt melting of alkali metal, cationic resin adsorption, evaporative crystallization and formic acid reduction; pretreating rhodium ash by formate; performing re-pickling, washing away most base metals, after drying, uniformly mixing with acid salt of alkali metal and an auxiliary agent to form powder, and carrying out melting reaction in a muffle furnace; adding deionized water to leach a melt, enabling thetreated leach liquor to pass through cationic resin, thoroughly removing base metals, performing concentrating and drying to obtain high-purity rhodium trichloride, eluting the resin by using hydrochloric acid after the resin adsorbs iron to be saturated, and adding formic acid into the eluent to reduce rhodium, thereby realizing separation of rhodium and iron in the resin eluent. The invention aims to provide a method for recovering rhodium chloride from rhodium slag, which has the advantages of simple recovery technique, no environmental pollution and high rhodium chloride purity for rhodium chloride recovery.
Description
technical field [0001] The invention belongs to the recovery of precious metals, in particular to a method for recovering rhodium chloride from rhodium slag. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Rhodium compounds are widely used in basic chemical industry and pharmaceutical chemical industry as the main raw material of electroplating solution, acetic acid synthesis catalyst and olefin oxo synthesis catalyst. In order to facilitate the use, measurement and transportation of rhodium compounds, rhodium is usually processed into rhodium chloride products for future use. Therefore, it is of great significance to recover rhodium in the spent rhodium catalyst in the ...
Claims
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